Differential Gearing - BMW Forum - BimmerWerkz.com
3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

 
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#1 (permalink) Old 08-31-2005, 02:34 AM
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well after having my rear window re-glued to its frame 150$ (could of been upgrade money), i decided to talk to the guy about better performance on my 93 318is,he said to raise the rear differential gearing for the best performance upgrade,he is currently running a 4.45 in his evo e30 m3 , so does anyone know a good place to get a differential for a 318 because its different then the 6 cyl cars, thanks
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#2 (permalink) Old 08-31-2005, 03:19 AM
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i believe that 318 diff is 4.44 or a 3.91 , you do get excellent performance out of it but going too high is risky, some people have to consider highway driving, for instance im looking for a 3.38 but the problem is that if i go higher then that ill be looking at very high RPMS at highway speeds.

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#3 (permalink) Old 08-31-2005, 08:19 AM
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Id go with some FI.

-Serge
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#4 (permalink) Old 08-31-2005, 11:03 AM
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The auto diff is 4.44 the manual I believe is 3.71 or 3.5X, because the people that do look into upgrading their diffs, look at putting in a 3.91 (for the 5spd'ers among us). If you put the 4.44 into a 5spd 318i, your top speed will be about 88mph, but you will get there very very quickly... But yes, it would be quite cheap to do.
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#5 (permalink) Old 08-31-2005, 11:20 AM
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Yeah furious is right my cousin has a diffrent diff in his integra, tops out at 100 used to top out at 130, sucks for highway driving because he is cruzing at like 5000 rpm



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#6 (permalink) Old 08-31-2005, 11:47 AM
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i did the math at 6400 rpm with a 3.91 final drive ratio you will be doing 120, at 5000 rpm youll be doing 80,hmmmmmmm!
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